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The Dalek eyestalk was mounted on the Dalek's dome and enabled the Dalek to see its surroundings. It was the only vulnerable part of the Dalek. (TV: Resurrection of the Daleks)

The Daleks produced by the Progenitor had radically redesigned eyepieces with black rings on the stick, fins on the cone, and the lens being organic rather than robotic. The viewpoint from this eyepiece is similar except for an opaque orange perimeter with honeycomb circuitry and protruding organic veins. (TV: Victory of the Daleks)

With a wide-angle lens, the eyepiece could magnify images so that the Dalek could see across great distances and also track a person's footsteps. (TV: Destiny of the Daleks) The eyepiece was the most vulnerable part of the Dalek. Dalek eyestalks from a post-Last Great Time War era were capable of even greater forms of magnification, with various scales displayed in-vision.

However, post-Time War Daleks overcame this exploitable weakness. Their shielding could resist most bullets, although bastic bullets were still somewhat effective. (TV: The Parting of the Ways) They could also melt any hindrance, as Wilfred Mott discovered when he shot a Dalek eyestalk with a paintball gun. The paint was immediately melted off and the Dalek was heard to say "My vision is not impaired". (TV: The Stolen Earth)